The newly oxygen-rich blood (shown in red) returns to the heart and enters the left atrium. Blood flows through the left atrium into the left ventricle. The left ventricle pumps the oxygen-rich ...

blood flows into the heart from a vein, goes into an atrium, then a ventricle, and out through an artery. The valves prevent the blood flowing backwards. The heart is relaxed and blood flows into ...

Your surgeon will make an incision in your chest to access your heart and will use a machine to take over blood flow while your heart is temporarily stopped. In some cases, minimally invasive ...

Every day, your heart tirelessly pumps blood through your circulatory system ... all working together to facilitate the vital process of blood flow. Good circulation is essential for keeping ...

Originally appeared on the NOVA Web site Cut to the Heart. Let's get straight to the heart of the matter—the heart's job is to move blood. Day and night, the muscles of your heart contract and ...